All deities have mortal servants: Followers (mortal), Minions (on the cusp of mortal and divine), and Servitors (divine beings). In their natural state, deities are purely spiritual beings.
Although they have great powers, deities are not mistaken for gods; no deity is omniscient, omnipresent, or omnipotent. Each has their own specialties, areas of influence where they hold great sway. No deity may grant a power which they themselves do not have.
The power of deities is in proportion to both their faithful in the region and the proximity to the nearest holy site of their faith. Although the exact process is unknown, it is widely believed that deities convert mortal faith into to the miracles they create.
Council (Greater Deities)
The Council is the term for the nine major deities to survive the Forgotten War. Each of the Council is opposed by two of the others, in a circle of opposition that ensures that no deity will grow to such a power level that they eclipse the others.
The Council are misers with their power; when they send divine aid, they send as little as is feasibly possible. Part of this is the opposition; it is believed that for every good deed a deity does for their worshippers, each of their opposition deities performs an act against their mortals.
Few differences exist between major spirits and minor deities. Since the Forgotten War, no minor deity has ascended to the Council.